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Student Support Forum: 'Determination of the sign of symbols' topicStudent Support Forum > General > "Determination of the sign of symbols"

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Rainer
12/11/05 04:40am

I would like to determine the sign of a algebraic combination of symbols, but Mathematica does not return a value for the Sign[] function, even if the sign is obvious. For example, if I define:
negative[a]^=True
negative[b]^=True
, then Mathematica returns not the correct result for Sign[a*b], which should be "1", but just returns "Sign[a*b]", indicating that Mathematica is not able to determine the sign of the product of "a" and "b". Is Mathematica in general not able to determine the sign of algebraic combinations of symbols, or is it a mistake of mine?
Thanks for help!
Rainer


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Author Date Posted
Determination of the sign of symbols Rainer 12/11/05 04:40am
Re: Determination of the sign of symbols yehuda ben-s... 12/14/05 3:37pm
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